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<p>Ethylene propylene diene monomer (EPDM) cables are widely used in rail transit, but their mechanical and electrical properties need improvement to meet growing capacity demands. This study uses EPDM from these sectors as the base material and kaolin as a filler, analyzing how different ethylene contents affect the properties of EPDM/kaolin composites. Results show that increasing ethylene content enhances the composites overall performance. At 50&#xa0;Hz, the dielectric constant decreases from 2.7 to 2.5, and tanδ drops from 10<sup>−2</sup> to 10<sup>−3</sup>, while breakdown strength increases. Molecular simulations reveal that free volume decreases with higher ethylene content, though volume resistivity remains stable at 10<sup>15</sup>&#xa0;Ω&#xa0;cm. Mechanically, tensile strength rises with ethylene content, whereas elongation at break gradually decreases. And the mechanism of the influence of ethylene content on its properties was analyzed. This work has important guiding significance for the selection of rail transit cable insulation materials.</p>

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Effect of ethylene content on the electrical and mechanical properties of ethylene propylene diene monomer cable

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Dongjun Yang,
  • Hao Feng,
  • Jingbing Wang,
  • Zhaolu Cheng,
  • Jiaxing Wang,
  • Xuguang Zhou,
  • Wenhao Deng,
  • Yanhui Wei,
  • Guochang Li

摘要

Ethylene propylene diene monomer (EPDM) cables are widely used in rail transit, but their mechanical and electrical properties need improvement to meet growing capacity demands. This study uses EPDM from these sectors as the base material and kaolin as a filler, analyzing how different ethylene contents affect the properties of EPDM/kaolin composites. Results show that increasing ethylene content enhances the composites overall performance. At 50 Hz, the dielectric constant decreases from 2.7 to 2.5, and tanδ drops from 10−2 to 10−3, while breakdown strength increases. Molecular simulations reveal that free volume decreases with higher ethylene content, though volume resistivity remains stable at 1015 Ω cm. Mechanically, tensile strength rises with ethylene content, whereas elongation at break gradually decreases. And the mechanism of the influence of ethylene content on its properties was analyzed. This work has important guiding significance for the selection of rail transit cable insulation materials.